* {
	padding: 0;
	margin: 0;
}
li {
	list-style: none;
}
@media screen and (max-width:1299px) {
	#mDiv{
		width: 95%;
		margin: 0 auto;
		line-height: 60px;
	}
	.leftdiv{
		float: left;
		width: 30%;
		margin: 0px 10px;
		height: 100%;
	}
	.rightdiv{
		float: left;
		height: 100%;
		width: 80%;
	}
	.rightdiv h3{
		margin-top: 40px;
		height: 40px;
		font-size: 20px;
		font-weight: bold;
		border-bottom: 1.5px solid #ccc;
	}
	#introTeacher{
		margin-left: 40px;
		float: left;
		height: 300px;
		width: 200px;
	}
	.firstUl{
		margin: 0 auto;
	}
	.firstUl>li{
		margin-top: 10px;
		line-height: 20px;
	}
	.firstUl li>img{
		width: 129px;
		height: 166px;
	}
	.secondUl li{
		float:left;
		list-style: none;
	}
	.secondUl li a{
		display:block; 
		width:30px; 
		height:30px;
		line-height:30px; 
		margin-right: 10px;
		text-align:center;
		color:red; 
		font-weight: bold;
		text-decoration:none; 
	}
	.secondUl > :first-child + li a,.secondUl > :first-child + li + li a{
		display:block; 
		width:30px; 
		height:30px; 
		line-height:30px; 
		text-align:center;
		color:blue; 
		font-weight: bold;
		text-decoration:none; 
	}
}
@media screen and (max-width:1299px) {
	#mDiv{
		width: 1200px;
		margin: 0 auto;
		line-height: 60px;
	}
	.leftdiv{
		float: left;
		width: 30%;
		margin: 0px 10px;
		height: 100%;
	}
	.rightdiv{
		margin: 0 10px;
		float: left;
		height: 100%;
		width: 80%;
	}
	.rightdiv h3{
		margin-top: 40px;
		font-size: 20px;
		font-weight: bold;
		border-bottom: 1.5px solid #ccc;
	}
	#introTeacher{
		margin-left: 40px;
		float: left;
		height: 350px;
		width: 200px;
	}
	.firstUl{
		margin: 0 auto;
	}
	.firstUl>li{
		margin-top: 10px;
		line-height: 20px;
	}
	.firstUl li>img{
		width: 129px;
		height: 166px;
	}
	.secondUl li{
		float:left;
		list-style: none;
	}
	.secondUl li a{
		display:block; 
		width:30px; 
		height:30px;
		margin-right: 10px;
		line-height:30px; 
		text-align:center;
		color:red; 
		font-weight: bold;
		text-decoration:none; 
	}
	.secondUl > :first-child + li a,.secondUl > :first-child + li + li a{
		display:block; 
		width:30px; 
		height:30px; 
		line-height:30px; 
		text-align:center;
		color:blue; 
		font-weight: bold;
		text-decoration:none; 
	}
}